<%@page contentType="text/html;charset=utf-8" %>

<%
  request.setAttribute("username","zhansgan");
  request.setAttribute("obj",new Object());
%>
<%--将request域中数据取出来，并且将其输出到浏览器 java代码怎么办？--%>
<%=request.getAttribute("username")%><br/>
<%=request.getAttribute("obj")%><br/>


<hr/>
<%--el表达式怎么取--%>
${username}<br/>
${obj}<br/>